Science
Mechanism of Action
This ingredient functions dynamically within formulations. As a PEG derivative, it acts as a humectant by forming hydrogen bonds with water molecules, thereby enhancing moisture retention in the skin. It also provides emollient qualities, softening and lubricating the skin surface, and serves as a solvent. The Stearmonium Chloride portion, a quaternary ammonium compound, contributes a specific charge density, which is advantageous for skin conditioning and its primary role as an antistatic agent. Furthermore, its emulsifying capability is crucial for stabilizing immiscible phases in creams and lotions, ensuring a consistent and uniform product.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyethylene glycols (PEGs) are prone to chemical changes over time, including increases in aldehydes, carboxylates, peroxides, and ionic strength, alongside a decrease in pH. This degradation accelerates under warm temperatures, light exposure, and the presence of oxygen. Optimal stability for PEG solutions is observed when stored frozen (-20°C), with refrigerated storage (4°C) being more stable than room temperature. To minimize aging, oxygen should be purged from containers with an inert gas like argon, and products should be protected from light.
Conflicts
- Quaternary ammonium compounds are generally considered potentially irritating if not precisely formulated.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed related 'PEG Stearates' and a group of 'Trimoniums' (which includes similar quaternary ammonium compounds like Steartrimonium Chloride), concluding them safe for cosmetic use when formulated to be non-irritating. The Scientific Committee on Consumer Safety (SCCS) has recommended maximum levels for certain trimethylammonium chlorides (including Steartrimonium Chloride): up to 0.5% for the sum of Cetrimonium and Steartrimonium Chloride in rinse-off hair products, up to 3% for the total sum of Behentrimonium, Cetrimonium, and/or Steartrimonium Chloride in rinse-off hair products, and a maximum of 0.1% in leave-on facial creams. However, there is no direct, specific safety assessment available for PEG-2 Stearmonium Chloride as a distinct combined ingredient, underscoring the importance of careful formulation within general guidelines for its constituent parts.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-2 Stearmonium Chloride is a valuable multifunctional ingredient offering emulsification, antistatic, and conditioning benefits, though its formulation requires precision to ensure non-irritancy given the lack of specific safety data for this exact compound.
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